Friction-clutch



'(No Model.)

L. D. DANA. FRIQTIONOLUTGH. No. 254,283. Patented Feb. 28,1882.

Wtxmeesea. v 'Lwuewoof. vcfiwOkm/ idz aszm NITED STATES Fries.

PAT NT FRICTiON-CLUTCH.

SPECIFICATION forming part of Letters Patent No. 254,283, dated February 28, 1882.

To all whom it may concern:

Be it known that I, LESTER D. DANA, a citizen of the United States, residing at Waupaca, in the county of Waupaca and State of Wisconsin, have invented new and useful Improvements in Friction-Clutches, of which the following is a specification.

This invention relates to that class ofclutohes for which Letters Patent of the United States were granted to me June 25, 1878, No. 205,362; and it consists essentially in duplicating the segment, the cam, and their concomitants, as hereinafter fully described, for the purpose of insuringthe correct operation of the apparatus and relieving the driven shaft ofstrain.

This invention is illustrated in the accompanying drawings, in which Figure 1 represents a cross-sectiontaken on the linear m, Fig. 2. Fig. 2 is a longitudinal section taken on the line y 3 Fig. 1.

Similar letters indicate corresponding parts.

TheletterA designates the shaft to be driven, carrying the fixed disk B and the loose disk 0, the former being provided with aflange, B.

YVithin the fixed disk Bare located two seg ments, D D, both bearing against the .inner surface of its flange B, and also a double cam or dog, E E, having its parts or members arranged to bear against the inner edges of the segments, respectively, such inneredges of the segments being eccentric to the axis of the shaft A.

At one end of each of the segments D D is formed an inwardly-projecting toe, f or f, while the double cam E E is provided with toes g 9, adjacent to the toes of the segments.

The loose disk 0 is located next to the fixed disk B on the shaft A, and it is provith-d with two laterallyprojecting pins, h h, whereby it engages the double cam E E, the latter being provided with holes or sockets for the reception of these pins. When the loose disk 0 is turned in the direction of the arrow seen in Fig. 1 the respective members of the double cam E E are pressed against the segments D Application filed August 15, 1881. (No model.)

D, and the latterin turn are pressed or wedged against the flange B of the fixed disk with a tendency to turn the latter, together with the shaft A, in a corresponding direction to the loose disk, while if the motion of the loose disk is now reversed the toes g g of the double cam catch the toesff of the segmentsand cause the latter to share the reverse motion of the loose disk, at the same time allowingthe fixed disk to continue its forward revolving motion together with the shaft.

The disadvantage attending the-use of the single segment and cam shown and described in my before-mentioned patent is that if the segment is ata point above the shaft when the loose disk begins its forward or working motion it is liable to disengage itself from the flange of the fixed disk by gravity, leaving a space between it and the flange, the result of which is that the segment is carried to a point below the shaft before the cam begins to act thereon, whereas by the use of the two segments and double cam one of the segments is always exposed to the action of the cam. Another advantage gained is that the strain due to the pressure of the cam is borne entirely by the flange of the fixed disk, relieving the shaft of all strain.

Vhat I claim as new, and desire to secure by Letters Patent, is-

The combination, substantially as hereinbefore set forth, with the driven shaft, of the fixed disk, the two segments having an inwardly-projecting toe at one end, the double cam having toes adapted to catch the toes of the segments, and the loose disk engaging the double cam, for the purpose described.

In testimony whereof I have hereunto set my hand and seal in the presence of two subscribing witnesses.

LESTER D. DANA. n s] 

